Finding the Fourth Proportional to 16,665.51, 25,005.21 and 7,312.25

Step by Step Solution

1. Step 1: Write the proportion equation
   16,665.51 : 25,005.21 = 7,312.25 : x
2. Step 2: Convert to fraction form
   16,665.51/25,005.21 = 7,312.25/x
3. Step 3: Cross multiply
   16,665.51x = 25,005.21 × 7,312.25
4. Step 4: Simplify right side
   16,665.51x = 182,844,329.28
5. Step 5: Solve for x
   x = 182,844,329.28/16,665.51
6. Step 6: Final answer
   x = 10,971.42